O.K., Here's the daily dumb question. How do you know if the mag is a real U.S.G.I. MAG? Other than the word Colt or Adventure, is there any stamping that actually says U.S.G.I. And how many different manufacturers have or had contracts to make them. Please name them if you can. Also, is there any kind of date stamped on them. Sorry for sounding so dumb but I'm new to the AR thing and only want to buy the good stuff. Thanks for any inputBASE-RIGGER